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ASTM C1498-04a

(Test Method)

Standard Test Method for Hygroscopic Sorption Isotherms of Building Materials

Standard Test Method for Hygroscopic Sorption Isotherms of Building Materials

SIGNIFICANCE AND USE
The purpose of these tests is to obtain, for a specified temperature, by means of a specified laboratory procedure, the values of the equilibrium moisture content at various levels of RH. These values are used either as means to characterize the material or as material characteristics needed as input to appropriate computer models that can simulate wetting or drying potential of individual building materials or material assemblies under specified environmental conditions.
A specified value of the equilibrium moisture content can also be used for material characterization. If this type of material characterization is called for in a material specification (for example, mineral or cellulose fiber insulation), the equilibrium at 95 ± 3 %RH shall be used.  
For ease and repeatability of measurements, the measurements for characterization are performed on adsorption isotherms. Though desorption is the reverse of adsorption, most porous materials reach different equilibrium levels during these two processes. Usually, the equilibrium moisture content on the desorption isotherm is higher than that on the adsorption isotherm for the same level of RH.
SCOPE
1.1 This test method specifies a laboratory procedure for the determination of hygroscopic sorption isotherms of any construction materials. The method was originally developed for the ASTM Thermal Insulation committee.
1.2 For material characterization, the primary emphasis is on the adsorption isotherm (that is, sorption isotherm that describes the wetting process of the material from the oven-dry condition).
1.3 Determination of desorption isotherm, (that is, sorption isotherm that describes the drying process of a material from the state of absolute saturation with water) is performed when information on drying characteristics of construction materials is required. Typically both adsorption and desorption isotherms are required for the purpose of hygrothermal models.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Aug-2004
ICS
91.120.30 - Waterproofing
Technical Committee
C16 - Thermal Insulation
Drafting Committee
C16.33 - Insulation Finishes and Moisture
Current Stage
Ref Project

Relations

Replaces
ASTM C1498-04 - Standard Test Method for Hygroscopic Sorption Isotherms of Building Materials
Effective Date
01-Sep-2004
Replaced By
ASTM C1498-04a(2010)e1 - Standard Test Method for Hygroscopic Sorption Isotherms of Building Materials
Effective Date
01-Nov-2010
Referred By
ASTM E3069-19a - Standard Guide for Evaluation and Rehabilitation of Mass Masonry Walls for Changes to Thermal and Moisture Properties of the Wall
Effective Date
01-Sep-2004
Referred By
ASTM C1761/C1761M-23 - Standard Specification for Lightweight Aggregate for Internal Curing of Concrete
Effective Date
01-Sep-2004
Referred By
ASTM C1699-09(2023) - Standard Test Method for Moisture Retention Curves of Porous Building Materials Using Pressure Plates
Effective Date
01-Sep-2004

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ASTM C1498-04a - Standard Test Method for Hygroscopic Sorption Isotherms of Building MaterialsASTM C1498-04a - Standard Test Method for Hygroscopic Sorption Isotherms of Building Materials
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ASTM C1498-04a - Standard Test Method for Hygroscopic Sorption Isotherms of Building Materials
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C1498–04a
Standard Test Method for
1
Hygroscopic Sorption Isotherms of Building Materials
This standard is issued under the fixed designation C1498; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.2 desorption isotherm—the sorption isotherm measured
exclusively during the hygroscopic desorption process started
1.1 This test method specifies a laboratory procedure for the
from the condition of full water saturation of the material.
determination of hygroscopic sorption isotherms of any con-
3.1.3 hygroscopic adsorption—fixation of water molecules
struction materials. The method was originally developed for
from ambient air on surfaces of a material until equilibrium is
the ASTM Thermal Insulation committee.
established.
1.2 For material characterization, the primary emphasis is
3.1.4 hygroscopic desorption—release of adsorbed water
on the adsorption isotherm (that is, sorption isotherm that
molecules from surfaces of a material into the ambient air until
describes the wetting process of the material from the oven-dry
equilibrium is established.
condition).
3.1.5 hysteresis—a physical phenomenon which makes the
1.3 Determination of desorption isotherm, (that is, sorption
desorption isotherm different from the adsorption isotherm due
isotherm that describes the drying process of a material from
to the difference in the energy level of pore water.
the state of absolute saturation with water) is performed when
3.1.6 moisture content, by mass—mass of water retained in
information on drying characteristics of construction materials
the specimen divided by the dry mass of the specimen.
isrequired.Typicallybothadsorptionanddesorptionisotherms
3.1.7 moisture content, by volume—volume of water re-
are required for the purpose of hygrothermal models.
tained in the specimen divided by the volume of the dry
1.4 This standard does not purport to address all of the
specimen.
safety concerns, if any, associated with its use. It is the
3.1.8 sorption isotherm—relationship between the relative
responsibility of the user of this standard to establish appro-
humidity (RH) (see Test Method E337) and the equilibrium
priate safety and health practices and determine the applica-
moisture content of the material, at a specified temperature.
bility of regulatory limitations prior to use.
4. Significance and Use
2. Referenced Documents
2
4.1 The purpose of these tests is to obtain, for a specified
2.1 ASTM Standards:
temperature, by means of a specified laboratory procedure, the
E104 Practice for Maintaining Constant Relative Humidity
values of the equilibrium moisture content at various levels of
by Means of Aqueous Solutions
RH. These values are used either as means to characterize the
E337 Test Method for Measuring Humidity with a Psy-
material or as material characteristics needed as input to
chrometer (the Measurement of Wet- and Dry-Bulb Tem-
appropriate computer models that can simulate wetting or
peratures)
drying potential of individual building materials or material
3. Terminology assemblies under specified environmental conditions.
4.2 A specified value of the equilibrium moisture content
3.1 Definitions of Terms Specific to This Standard:
can also be used for material characterization. If this type of
3.1.1 adsorption isotherm—the sorption isotherm measured
materialcharacterizationiscalledforinamaterialspecification
exclusively during the hygroscopic adsorption process started
(for example, mineral or cellulose fiber insulation), the equi-
from the oven-dry condition.
librium at 95 6 3 %RH shall be used.
4.3 For ease and repeatability of measurements, the mea-
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC16onThermal
surements for characterization are performed on adsorption
Insulation and is the direct responsibility of Subcommittee C16.33 on Insulation
isotherms. Though desorption is the reverse of adsorption,
Finishes and Moisture.
most porous materials reach different equilibrium levels during
Current edition approved Sept. 1, 2004. Published October 2004. Originally
approved in 2001. Last previous edition approved in 2004 as C1498–04. DOI:
these two processes. Usually, the equilibrium moisture content
10.1520/C1498-04A.
onthedesorptionisothermishigherthanthatontheadsorption
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
isotherm for the same level of RH.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Bar
...

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5.3 The data obtained from this test method will not permit prediction of the service life of a membrane. Membrane flexibility is important during application, and changes in flexibility are believed to be linked to the performance of roofing and waterproofing membranes, but the actual link between test data and performance is unknown and is dependent on the materials and exposure.
SCOPE
1.1 This test method measures the flexibility of roofing or waterproofing sheet materials or membranes by bending the test material over a block containing arcs of specific radii at a standard temperature.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
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ASTM
ASTM D6532-00(2022)(Test Method)
Standard Test Method for Evaluation of the Effect of Clear Water Repellent Treatments on Water Absorption of Hydraulic Cement Mortar Specimens

SIGNIFICANCE AND USE
5.1 Siliceous alkaline substrates are subject to water damage that may result in deterioration. Water repellents can provide protection of siliceous alkaline substrates exposed to water. This test method is used to evaluate the efficacy of clear water repellents on alkaline substrates.
SCOPE
1.1 This test method evaluates the effectiveness of clear water repellents on hydraulic cement mortar specimens based on water absorption after a water soak.  
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    3 pages
    English language
    sale 15% off